// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/synchronization/condition_variable.h"

#include "base/synchronization/lock.h"
#include "base/synchronization/sync_xp.h"
#include "base/threading/thread_restrictions.h"
#include "base/time/time.h"

namespace base {

ConditionVariable::ConditionVariable(Lock* user_lock)
    : srwlock_(user_lock->lock_.native_handle())
#if DCHECK_IS_ON()
    , user_lock_(user_lock)
#endif
{
    DCHECK(user_lock);
    InitializeConditionVariableXp(&cv_);
}

ConditionVariable::~ConditionVariable()
{
}

void ConditionVariable::Wait()
{
    TimedWait(TimeDelta::FromMilliseconds(INFINITE));
}

void ConditionVariable::TimedWait(const TimeDelta& max_time)
{
    base::ThreadRestrictions::AssertWaitAllowed();
    DWORD timeout = static_cast<DWORD>(max_time.InMilliseconds());

#if DCHECK_IS_ON()
    user_lock_->CheckHeldAndUnmark();
#endif

    if (!SleepConditionVariableSRWXp(&cv_, srwlock_, timeout, 0)) {
        DCHECK_EQ(static_cast<DWORD>(ERROR_TIMEOUT), GetLastError());
    }

#if DCHECK_IS_ON()
    user_lock_->CheckUnheldAndMark();
#endif
}

void ConditionVariable::Broadcast()
{
    WakeAllConditionVariableXp(&cv_);
}

void ConditionVariable::Signal()
{
    WakeConditionVariableXp(&cv_);
}

} // namespace base
